[`SDXL-Turbo`] Add SDXL-Turbo scheduler to `from_single_file` #16173

Job	Run time
Fast PyTorch Pipeline CPU tests	13m 48s
Fast PyTorch Models & Schedulers CPU tests	3m 35s
Hub tests for models, schedulers, and pipelines	1m 57s
LoRA	2m 11s
Fast Flax CPU tests	4m 16s
PyTorch Example CPU tests	6m 15s
	32m 2s

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